Is Bitcoin really the only way to make using your computer's power? Folding @ Home is sorta like it, but it's a charity thing with no profit(I guess you can count pride though). Has anyone seen something like Bitcoin mining before?

Is Bitcoin really the only way to make using your computer's power? Folding @ Home is sorta like it, but it's a charity thing with no profit(I guess you can count pride though). Has anyone seen something like Bitcoin mining before?